HOMEVULNERABILITIESCVE-2020-27853
CRITICAL

CVE-2020-27853

CWE-134Published: October 27, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Wire before 2020-10-16 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a format string. This affects Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4, the Wire Secure Messenger application before 3.49.918 for Android, and the Wire Secure Messenger application before 3.61 for iOS. This occurs via the value parameter to sdp_media_set_lattr in peerflow/sdp.c.

NVD Source

Technical Analysis

CVE-2020-27853 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

wire3 product(s)
wirewire - audio\, video\, and signalingwire secure messenger
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttp://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.html
ADVISORYhttps://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689
ADVISORYhttp://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.html
ADVISORYhttps://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689

All References (4)

→
http://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.htmlExploit · Third Party Advisory
→
https://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689Exploit · Third Party Advisory
→
http://github.security.telekom.com/2020/11/wire-secure-messenger-format-string-vulnerability.htmlExploit · Third Party Advisory
→
https://github.com/wireapp/wire-audio-video-signaling/issues/23#issuecomment-710075689Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2020-27853
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-134
CISA KEVNo
Affected1 vendor(s)
PublishedOct 27, 2020

Related CVEs (CWE-134)

CVE-2010-2451
10.0
CVE-2006-3573
10.0
CVE-2006-3628
10.0
CVE-2008-5982
10.0
CVE-2005-3656
10.0
CVE-2009-2548
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27853 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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